I read all the books before they turned it into a TV program. I like the show, but it kind of ruined the images I had in my mind. Especially Vic. She was much better looking in my mind. And part of her allure in the books is the language she uses, stuff she cannot say on TV.
I like the Longmire books, but you can't beat C.J. Box. He's a real Wyoming guy and it shows in the stories. Johnson is a fairly recent transplant and Ucross has become sort of artsy-fartsy.